** Also affects: cloud-initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
** Description changed:
[Impact]
This is a design flaw that needs to be fixed. Basically we inherited the
design from old Ubuntu Core devices that the boot configuration is
prepared in the gadget and - therefore - is quite static. Newer Core
devices have mechanisms for updating boot assets, while classic
images... well, we never actually thought about it.
Now that we have a valid use-case for preinstalled amd64 images, we
actually need to make sure we can update at least the grub config
somehow. To do this, we introduce the hook from preinstalled desktop
images from groovy+ with an additional change to generate the grub.cfg
by using `update-grub2`. We switch the design to now only shipping a
blanket grub.cfg on the boot partition, pointing to the rootfs one -
which can be freely updated via existing mechanisms.
While adding the hook, we also fix a few other technical dept - like
adding a swap file and making the rootfs resizable. Everything that we
already had for our Pi images in groovy+.
+ The growroot part might also require a quick workaround in cloud-
+ initramfs-tools.
+
[Test Case]
Build an image with -proposed enabled, make sure that it still boots as
before on Intel IOT platforms. Try booting the image on an USB when
there are other USB drives present on the device.
[Regression Potential]
This can basically only regress intel-iotg desktop images, which is what
we want to fix right now. But it requires for the images to go through
the whole testing cycle again, to make sure that everything still works
- since we're basically switching to a completely new grub.cfg. The test
case should be sufficient to make sure there are no regressions.
+
+ The cloud-initramfs-tools changes for growroot might, in some very weird
+ way, break cloud image resizing. So it would be good to double check
+ with the CPC team if images still work as expected with this change.
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https://bugs.launchpad.net/bugs/1949102
Title:
Preinstalled amd64 images cannot upgrade grub.cfg on boot partition +
technical debt
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